JP2949092B2 - Adjustable length support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a standpipe, a length adjusting element provided in the standpipe, and a bottom plate for supporting the length adjusting element in an axial direction. Comprises a cylinder having an axially movable piston rod, the bottom plate being held on the one hand by a bent part bent inside the standpipe and on the other hand by at least one support surface provided on the inner wall of the standpipe. The present invention relates to a column having an adjustable length for a chair, a table, and the like, in which a stand pipe has an end surface at an end on a deformation portion side.

[0002]

2. Description of the Related Art Utility model registration No. 762 of the Federal Republic of Germany
No. 3283 discloses a guide column for continuously adjusting the height of a chair seat surface. In the case of this guide post, it is fixed between a deformed portion whose bottom is bent inward at a right angle and a circumferential groove as a support surface formed on the inner wall of the guide post. In this case, there is a problem that the bottom is formed by a simple disk and is affected by an error in the material thickness. Therefore, in the case of an undesired boundary condition, the prestress of the deformed portion with respect to the bottom is not sufficient, and the generation of rattling noise cannot be excluded. The same applies to the embodiments described in German Utility Model Registration No. 8524341 and European Patent 0 366 889. In the case of this European patent,
In order to position the bottom at right angles to the standpipe, the problem is that the bent end face must be very flat.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple fixing structure of a bottom plate in a standpipe, which eliminates rattling noise due to undesired errors and can be manufactured easily. That is.

[0004]

This object is achieved according to the invention in that the end face of the end of the standpipe faces towards the inner wall and the bottom plate rests on the outer wall of the standpipe. In the case of this fixed structure, the error of the end face is not a problem. Large deformation angles compared to the state of the art result in very large strengths. When assembling the bottom plate,
The bottom plate is inserted into the standpipe up to at least one support surface. In this case, the end of the standpipe points upwards towards the bottom plate. Then, since the deformed portion presses the bottom plate against the support surface, rattling noise is eliminated.

In an advantageous embodiment, the end faces are in contact with the inner wall. This forms a closed bulge with very high strength. The deformation operation can be performed by controlling the force. This is because a peak of force occurs when the end face contacts the inner wall.

In order to make the deforming tool as simple as possible,
The deformation part is formed in an arc shape. When the deformation is started by an appropriate mold, the deformation proceeds as the feeding motion of the deforming tool progresses. The standpipe can be easily removed from the device again, since a very simple mold with a short deformation radius can be used.

Further, the width of the deformed portion in the inward direction is larger than its height. Such a shape is obtained by upsetting a circular deformation. A very large mounting surface for the bottom plate results.

It has been found to be particularly advantageous if the end of the standpipe has a reduced wall thickness in the region of the deformation.
Deformation can be performed with a small amount of effort, and an elastic action known in the state of the art that effectively prevents rattling can be obtained.

If the reduced wall thickness portion is formed on the inner peripheral surface of the stand pipe, a step is formed on the inner wall, and there is an advantage that the step serves as a support surface for the bottom plate. In this case, no grooves or other types of support surfaces are required.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. FIG. 1 shows an adjustable length support 1 for a table, chair or the like. The length-adjustable strut is provided in particular with a length adjustment element 3. This length adjusting element is a cylinder 5 having a piston rod 7 which is movable in the axial direction.
It has. As the length adjusting element, for example, utility model registration No. 7623283 or WO96 / 0306
5, pneumatic, hydraulic and / or mechanical devices can be used. The guide bush 9 centers the cylinder in the stand pipe 11.

The piston rod 7 is rotatable relative to the stand pipe 11 via an axial bearing 13, but is fixed via a bottom plate 15 so as not to move axially with respect to the stand pipe. In some cases,
The contact buffer 17 can be used as an entry stopper. The bottom plate is fixed in the axial direction by a deformed portion 19 shown enlarged in FIG.

As can be seen in FIG. 2, the curved deformation 19 has an overall angle of more than 180 ° at the end of the standpipe 11. Therefore, the end face 21 is
3, the bottom plate 15 rests on the outer wall 25 of the standpipe. Depending on the embodiment, the end face 21 can contact the inner wall, resulting in a closed annular bulge. The deformation portion 19 is formed in an arc shape. in this case,
First, a radius of curvature that does not cause the outer wall 25 to directly contact the outer surface of the bottom plate 15 is selected. Then, during the feeding movement for deformation, the outer wall slides along the bottom plate toward the inner wall 23 under prestress.

The piston rod 7 is held by a holding clip 29 and a disk 27. For external reasons, the axial height of the deformed portion 19 is higher than the structural height of the holding clip and the disk 27. Of course, as described above, in order to make the mounting surface generated by the outer wall 25 as large as possible, the width B of the deformed portion in the inward direction is the height H in the axial direction.
Is bigger than. Since the deformed part is formed in an arc shape as described above, the adaptation of the height to width ratio of the deformed part can be achieved by a simple crush (upsetting).

Starting from the bottom plate 15, the standpipe has a wall thickness reducing portion 31 on the inner wall 23 side. There is a step provided as a support surface 33 for the bottom plate. The deformed portion can be weakly formed by the reduced wall thickness portion. Further, the deformed portion has a moderately elastic characteristic, and reduces noise and impact when hitting.

During manufacture, first, the support surface 33 is formed, for example, by reducing the wall thickness. The stand pipe 11 is set in the apparatus such that the end to be deformed faces upward. Since the bottom plate 15 is placed on the support surface and the deformed portion 19 is formed, an error in the thickness of the disk of the bottom plate has no effect.
It does not matter whether the outer wall 25 has a floor support surface inboard or outboard.

[Brief description of the drawings]

FIG. 1 is an overall view of an adjustable-length column.

FIG. 2 is a detailed view of a deformation unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support 3 Length adjustment element 5 Cylinder 7 Piston rod 11 Stand pipe 15 Bottom plate 19 Deformation part 21 End face 23 Inner wall 25 Outer wall 31 Wall thickness reduction part 33 Support surface

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47C 3/30 A47B 9/10

Claims (6)

(57) [Claims] 1. A stand pipe (11) , a length adjusting element (3) provided in the stand pipe, and a bottom plate (15) axially supporting the length adjusting element.
The length adjusting element (3) comprises a cylinder (5) having an axially movable piston rod (7) and a bottom plate (1).
5) is, on the one hand, held by a deformed part (19) bent inside the stand pipe (11) , and, on the other hand, is held by at least one support surface (33) provided on the inner wall (23) of the stand pipe (11). Is a stand pipe
An end face (21) of an end of a standpipe (11) in an adjustable-length column for a chair, a table, or the like, wherein (11) has an end face (21) at an end on a deforming part (19) side.
Facing towards the inner wall (23), the bottom plate (15) resting on the outer wall (25) of the standpipe, the length of which is adjustable. 2. An end face (21) having a standpipe (11).
2. The adjustable length strut according to claim 1, wherein the strut is in contact with an inner wall of the first strut. 3. An adjustable length support according to claim 1, wherein the deformable portion is formed in an arc shape. 4. The device according to claim 1, wherein the width (B) of the inwardly deformed portion (19) is greater than its height (H).
Adjustable length support described. 5. The adjustable length strut according to claim 1, wherein the end of the standpipe has a reduced wall thickness in the region of the deformation. 6. A reduced wall thickness portion ( 31 ) is formed on the inner wall (23) of the standpipe (11), whereby a step is formed on the inner wall, and the step is formed on the support surface (33) of the bottom plate (15). 6. The method according to claim 5, wherein
Adjustable length support described.